Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2015-7871 — Improper Authentication in NTP

CWE-287 — Improper AuthenticationCWE-305 — Authentication Bypass by Primary WeaknessCWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-20 — Improper Input ValidationCWE-22 — Path TraversalCWE-264CWE-39933 documents12 sources
Severity
9.8CRITICALNVD
OSV5.3
EPSS
79.6%
top 0.91%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
4
NTPDebian NTPDebian Linux+1 more
Timeline
PublishedAug 7
Latest updateMay 13

Description

Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages5 packages

▶NVDntp/ntp4.2.6 — 4.2.8+3
▶debiandebian/ntp< ntp 1:4.2.8p4+dfsg-1 (bullseye)
▶Debianntp/ntp< 1:4.2.8p4+dfsg-1
▶Ubuntuntp/ntp< 1:4.2.6.p5+dfsg-3ubuntu2.14.04.5

Also affects: Debian Linux 7.0, 8.0, 9.0

🔴Vulnerability Details

3
GHSA
GHSA-mxc3-mjx4-gjc9: Crypto-NAK packets in ntpd in NTP 4↗2022-05-13
▶
OSV
CVE-2015-7871: Crypto-NAK packets in ntpd in NTP 4↗2017-08-07
▶
OSV
ntp vulnerabilities↗2015-10-27
▶

💥Exploits & PoCs

1
Metasploit
NTP "NAK to the Future"↗
▶

📋Vendor Advisories

24
CISA ICS
Siemens TIM 4R-IE Devices↗2021-04-13
▶
CISA ICS
Siemens RUGGEDCOM ROX-based Devices NTP Vulnerabilities↗2018-08-27
▶
CISA ICS
Rockwell Automation Stratix 5900↗2017-05-10
▶
Ubuntu
NTP vulnerabilities↗2015-10-27
▶
BSD
FreeBSD-SA-15:25.ntp: Multiple vulnerabilities of ntp [REVISED]↗2015-10-26
▶

🕵️Threat Intelligence

2
Talos
Cisco Identifies Multiple Vulnerabilities in Network Time Protocol daemon (ntpd)↗2015-10-21
▶
Talos
Cisco Identifies Multiple Vulnerabilities in Network Time Protocol daemon (ntpd)↗2015-10-21
▶

💬Community

2
Bugzilla
CVE-2015-7692 CVE-2015-7871 CVE-2015-7852 CVE-2015-7701 CVE-2015-7702 CVE-2015-7691 ntp: various flaws [fedora-all]↗2015-10-22
▶
Bugzilla
CVE-2015-7871 ntp: crypto-NAK symmetric association authentication bypass vulnerability↗2015-10-22
▶